Routines
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8F17: RUN
Running means going in a random direction. A random number from 1 to 9 is chosen (9BF4), and the exits of the room are tried from that direction onwards, cycling round, until one with a destination is found (9E51); the actor then moves that way (8D19).
8F17 LD A,$0A Pick a random direction from 1 to 10
8F19 CALL $9BF4
8F1C CP $00
8F1E JR Z,$8F17 (0 is not a real direction: try again)
8F20 LD B,A B = that direction
8F21 CALL $9E51 Is there a usable exit that way?
8F24 CP B
8F25 JR Z,$8F31 Yes: run that way
8F27 LD A,B No: try the next direction round instead...
8F28 INC A
8F29 CP $0A
8F2B JR C,$8F20
8F2D LD A,$01 ...wrapping back to 1 after 10
8F2F JR $8F20
8F31 LD ($B5D8),A That direction becomes the movement action
8F34 JP $8D19 Move that way
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